CVE-2026-62758 in Windows
Summary
by MITRE • 08/11/2026
Heap-based buffer overflow in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability exists within the Windows Remote Access Connection Manager component which handles network connection management for remote access services. The heap-based buffer overflow occurs when the system processes certain input data structures without proper bounds checking, allowing an attacker to overwrite adjacent memory locations in the heap allocation space. This flaw specifically affects the local privilege escalation capabilities of authenticated users who can leverage the vulnerability to gain elevated system privileges.
The technical implementation involves improper handling of user-supplied data within the connection manager's memory management routines where insufficient input validation allows attackers to craft malicious payloads that exceed allocated buffer boundaries. When the vulnerable code attempts to write data beyond the intended buffer limits, it overwrites critical heap metadata or adjacent allocated memory regions, potentially corrupting program execution flow or enabling arbitrary code execution in kernel mode contexts.
From an operational perspective this vulnerability represents a significant threat surface for systems running Windows Remote Access Connection Manager services, particularly in enterprise environments where remote access capabilities are commonly deployed. Attackers who have gained initial authenticated access to a system can exploit this weakness to escalate their privileges from standard user level to system administrator or kernel-level execution privileges. The vulnerability's local requirement means that attackers must first establish some form of legitimate access to the target system, though this could be achieved through various initial compromise vectors such as credential theft, phishing attacks, or exploitation of other remote access vulnerabilities.
The exploitability characteristics align with common attack patterns documented in the attack tactics and techniques framework where privilege escalation is a critical step in maintaining persistent access and achieving broader operational objectives. This vulnerability would typically map to ATT&CK technique T1068 for local privilege escalation and could be leveraged as part of broader attack chains involving lateral movement or data exfiltration operations. The underlying cause can be classified under CWE-121 heap-based buffer overflow which represents a well-documented class of memory safety issues that have historically led to severe security implications in operating system components.
Mitigation strategies should focus on immediate patch application from Microsoft security updates, which typically address the specific buffer management flaws in the affected components. System administrators should implement least privilege principles and restrict local access to systems running remote access services, while also monitoring for anomalous process behavior or memory corruption patterns that might indicate exploitation attempts. Network segmentation and access controls can help limit the potential impact of successful exploitation by preventing lateral movement within compromised environments. Additionally, implementing application whitelisting policies and regular security assessments of remote access configurations can provide additional defense layers against unauthorized access to systems where this vulnerability might be present.